Two-piece door knob construction

ABSTRACT

A door knob assembly which includes an inner molded plastic cupshaped base having an integral internal and external hub axially apertured to receive a spindle; and an outer metallic hub snugly assembled over said base and interlocked therewith.

United States Patent [1 1 Yulkowski 5] Jan. 15, 1974 TWO-PIECE DOOR KNOBCONSTRUCTION [75] Inventor: Leon Yulkowski, Pontiac, Mich.

[73] Assignee: General Lock Company, Detroit,

Mich.

221 Filed: May 26, 1972 21 Appl. No.: 257,196

[52] U.S. Cl. 292/347 [5|] Int. Cl. E056 1/00 [58] Field of Search292/169, 292, 347,

[56] References Cited UNITED STATES PATENTS 433,464 8/1890 Gustavson292/347 X Hil 3,179,459 4/l965 Lint 292/347 X 337,093 3/1886 Thistle292/347 Primary Examiner--Richard E. Moore Attprney- Cullen, Settle,Sloman & Cantor 5 ABSTRACT A door knob assembly which includes an innermolded plastic cup-shaped base having an integral internal and externalhub axially apertured to receive a spindle; and an outer metallic hubsnugly assembled over said base and interlocked therewith.

1 Claim, 2 Drawing Figures 1 TWO-PIECE DOOR KNOB CONSTRUCTION BACKGROUNDOF THE INVENTION Heretofore in many door knob assemblies, these areconstructed of solid metal and which includes central hub adapted toreceive conventional spindle.

It is an object of the present invention to provide a two-piece doorknob construction wherein the central base portion is cup-shaped with anannular wall and a transverse bottom wall and with an integral hubmolded thereto which projects inwardly of the base as well as outwardlytherefrom and is formed with a polygonal bore to snugly receive aconventional spindle. Onto the low cost base made of plastic, there isremovably mounted and interlocked therewith a metallic cupshaped shellof bronze, brass or aluminum to provide a solid door knob assembly inappearance at a greatly increased savings and manufacturing cost.

It is another object to provide an improved two-piece door knob whereinthe central base is made of plastic and with an integral hub thereonwhich projects inwardly and outwardly thereof to cooperatively andsnugly receive a conventional spindle and wherein the construction issuch as to facilitate an easy assembly and interlock with conventionaldoor rosettes.

It is a further object to provide an attractive twopiece door knobassembly wherein the outer cup is made of attractive bronze, brass,stainless steel or aluminum and has a finished appearance and whichconceals the inner inexpensive plastic cup-shaped body and hub assembly.Said cup may be non-metallic.

These and other objects will be seen from the following specificationand claims in conjunction with the appended drawing.

THE DRAWING In the drawing:

FIG. 1 is a fragmentary longitudinal section of the present two-piecedoor knob assembly.

FIG. 2 is a section taken in the direction of arrows 2-2 of FIG. 1.

It will be understood that the above drawing illustrates merely apreferred embodiment of the invention, and that other embodiments arecontemplated within the scope of the claims hereafter set forth.

DETAILED DESCRIPTION OF THE INVENTION Referring to the drawing, FIGS. 1and 2, the present door knob assembly 11 is applied to the door 13fragmentarily shown and which has a transverse bore to receive thespindle and portions of the door knob hub.

Outer rosette 15 has a corresponding bore 17 and a pair of integraloppositely arranged bosses 19 which are interiorly threaded and adaptedto receive fasteners 25.

Inner rosette 21 has a corresponding central bore and has a pair ofouter counter sunk bores 23 adapted to receive the heads of fasteners25. These fasteners extend through the inner rosette, throughcorresponding apertures in the door and threadedly engage bosses 19 ofthe outer rosette.

The present two-piece door knob includes a molded plastic base 29 ofcup-shape, providing an annular outer wall and transverse bottom wall31.

The molded plastic base 29 includes an axial hub portion which consistsof the outwardly extending exterior hub 33 and the inwardly directed orinterior hub 35.

Polygonal bore 37 extends axially through said hub and is adapted tosnugly and cooperatively receive spindle 39.

The outer hub 33 adjacent the base 31 has an annular shoulder 41 adaptedfor cooperative spacing registry with the inner rosette 2l. Suitablefastening means are mounted upon the outer end portion of the outer hub33 adapted to retainingly engage the inner rosette 21.

In the illustrative embodiment, this locking means is in the form of asnap ring 43 applied to the outer end portion of hub 33 and retaininglyengages the inner surface of rosette 21.

Formed through the bottom wall 31 of the plastic molded base are a pairof diammetrically arranged clearance apertures 45 providing access tofasteners 25 through which a suitable screw driver may be projected fortightening said fasteners and for securing the rosettes with respect tothe door.

The door knob is completed by the assembly upon the plastic base of themetallic cup 51 which is snugly or frictionally positioned over theouter annular wall of the plastic base 29.

The cup may be removably secured to the base frictionally or otherwise.In the illustrative embodiment, the method of securing includes thetransversely arranged elongated arcuate leaf spring 47 which bearsagainst the inner surface of the annular wall of base 29. Locking pin 49is secured to and projects through a central portion of the leaf springand radially outward through a corresponding aperture in the wall ofsaid base and selectively through one of a plurality of transverseradial bores 53 in said cup.

Thus, on assembly of the cup over the base, the pin 49 under the tensionof the leaf spring will snap into position when bore 53 is in registrytherewith. Similarly,

to remove the outer cup, pin 49 need be merely manually depressedagainst the action of the spring to provide sufficient clearance.

An additional door knob 55 is mounted over the outer end of spindle 39,with its hub 57 secured thereto by pin 59 or other securing device.

As a part of the final assembly, before cup 51 is positioned over base29, the spindle with its handle secured thereto is projected through thedoor and rosettes and through hub 35 on the interior of said base andsecured thereto by the nut 61 threaded thereon, or other suitablefastening device.

Having descirbed my invention, reference should now be had to thefollowing claims.

I claim: 1. A door knob assembly comprising a molded plastic cup shapedbase having an annular wall and radial end wall;

an axial hub on and a part of said end wall; said hub having an axialbore of polygonal cross section adapted to cooperatively receive aspindle;

and an outer metallic shell of cup shape snugly mounted over and alongand frictionally engaging said base and interlocked therewith, said cupextending completely over and enclosing said base and its end wall, theinterlock between said base and outer cup comprising a leaf springnormally tensioned against the interior of the base annular wall;

and a retractible locking pin secured to said leaf spring and extendingradially outward through corresponding apertures in said base annularwall and said cup.

1. A door knob assembly comprising a molded plastic cup shaped basehaving an annular wall and radial end wall; an axial hub on and a partof said end wall; said hub having an axial bore of polygonal crosssection adapted to cooperatively receive a spindle; and an outermetallic shell of cup shape snugly mounted over and along andfrictionally engaging said base and interlocked therewith, said cupextending completely over and enclosing said base and its end wall, theinterlock between said base and outer cup comprising a leaf springnormally tensioned against the interior of the base annular wall; and aretractible locking pin secured to said leaf spring and extendingradially outward through corresponding apertures in said base annularwall and said cup.